Ore-concentrator.



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S. K. BEHREND.

ORE OONGENTRATOR.

APPLIOATIO'N FILED JULY s, 1901.

916,257. Patented Mar.' 23, 1909.

2 SHEETS-SHEET 1.

Patented Mar. 23, 1909. A

2 SHEETS-SHEET 2.

I s. K. BBHREND. ORB GONGENTBTOB. APPLIGTION FILED JULY 3, 1907. 91 6,257.

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limK Ew! m Y are continued onward to the lower end of the SAMUEL K. BEHREND, OF DENVER, COLORADO.

ORE-CONCENTRATOR.

Specification ol Letters Patent.

Application filed July 3, 1907.

Patented March 23, 1909.

Serial No. 382,037.

To all whom it may concern.'

Be it known that I, SAMUEL K. Eminem), a citizen of the United States, residing at l Denver, in the county of Denver' and State of Colorado, have invented certain new and useful Improvements in Ore-Concentrators, j of which the 'following is a specification. i

.My invention relates to an improvement in ore concentrators, and more particularly to that variety of concentrators known as dry separators, the purpose of this :invention being to provide as near perlect separation as possible by the so-called dry process, which separation is accomplished by the discharge of the material in measured quantities at or near the center of the table, immediately belowwhich point of discharge the main separation takes place by the material coming in contact With a rapidly ilowing exhaust aircurrent, while the table itself is undergoing a rapid agitation, so that the particles of greatest specific gravity, namely the values table, which preferably inclincs a greater or less degree, while the lighter or waste products,-gangue, etc., known as tailings work their Way upward with the air-current, and are drawn through the suction chainbers beneath the table and disposed ot.

v`.lilith the foregoing objects in view, this invention comprises novel features and details oi construction, and arrangement of parts, which I will proceed to describe more fully hereinafter, and point out in the claim.

In the accompanying drawings:

Figure l is a vertical longitudinal'section of my improved ore concentrator. Fig. 2 is a plan view. Fig. 3 is a detail.

A, represents the base, and. l, 1, are uprights erected thereon.

B, indicates the concentrator table. This is preferably supported by reasonably stiff springs 3 and Ll at the upper' end where it is attached to the reciprocator 5, and it is suptor which rests in adjustable holders Vfor raising and lowering and regulating the inclination of the table. A hopper 8 is located at or near the center of the table and in the bottom of this hopper a grooved roller or butterfly valve 9, is mounted on the shaft l() whereby measured quantities of the ore are dropped upon the surface of the table as each groove empties its contents thereupon. The outer yends oi' the shaft 10 are provided With ratchet-toothed Wheels 11, l l, the gravity pawls 12, l2, pivoted to the main upper timbers of the l`rame\\'orl of the machine, imparting a step by step motion to the grooved roller or butterlly valve as the table is 'reciprocated so that the feed upon the table is intermittent, and in predetermined quantities.

'f'he surface of the table may or may not bo covered with rii'l'les arranged as described in my concurrently pending application for Letters Patent, iiled YDecember' i8, 190] g Serial No. 348,46), in which the table is provided with longitudinal slots and received in the slots are ritl'les, which are provided with openings through their upper surface through which the tailii'igs are sucked by a suction 'ir-n.

A contracted passage S is formed Vfor the purpose of causing the tailings-laden aircurrent to attain. greater .f'elocity and thus impart to :ach individual. particle of the tailings a greater momentum, thereby compeilingl the tailings to travel in an almost direct path to the outlet O.

0, is a narrow slit extending entirely across the machine and is normally covered by the strip of light canvas or other suitable material as shown at l), which permits the tailings to pass under it, but at the same time prevents air being drawn into the man chine through O.

Y, is an incline to prevent any material from lodging, which might be dropped in compartment X, by the air-current. .It will be noticed that the space between the lower edge of incline Y and the surface Z, is much greater than the distance across passage S, thus giving the air-current much less velocity as it enters the wedge--slm-ped passage lvl, in its journey to the fan, thereby causing the air-current to e'lfectuaily drop the solid parti cles it has heretofore been carrying with it. Meanwhile, through the shaking motion, the values beine' of greater specific gravity work their way down on the surface of the table, to the lower end where they are discharged. In this way measured quantities of ore are separately treated as it were; and by the time another quantity is discharged from the valve in the bottom of the hopper, the way is cleared for more perfect separation than could otherwise perhaps take place, and in this way a perfect separation is constantly taking place, so that a very large perce-.itage of values is saved in a single operation through the machine.

More or less slight changes might be resorted to in the forni and arrangement of the several parts described without departing from the spirit and scope of the exact construction herein set forth.

Having 'fully described my invention, what I claim as new and desire to secure by Letters Patent, is

1n an ore concentrator the combination with a table, and means for reciprocating said table, o' a hoper located at or near the middle of the tab e, a recessed roller in the bottom of said hopper, a shaft on which the roller is mounted, a ratchet wheel on the shaft7 pawls engaging the ratchet wheel whereby the roller is intermittently rotated,

a frame-work beneath the table in which the tailings are discharged through an opening at the upper end of the table, said iranieworli having a constricted Qassage and two inelines leading from said passage, the space between the inclines being greater at the outer ends and one of the said inclines being longer than the other', and a suctionfan beyond the constricted passage :for creating suction of air,

In testimony whereof have aliixed my signature in presence of two witnesses.

SAMUEL K. EEHREND. Writness'es JOHN T. HoLBRooK. GEO. H. SAUER. 

